<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-29 -029 23:00:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="2 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.01.29 (029) 23:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202602901292300009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.733" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.647" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="320.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="320.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="461.500" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="391.615" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="342.568" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.308" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="72.865" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="18.701" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="36.696" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="76.850" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.620" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="146">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 3.95 4.0 4.05 4.1 4.15 4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
320.000 320.833 321.667 322.500 323.333 324.167 325.000 325.000 325.000 326.000 327.000 328.000 329.000 330.000 331.250 332.500 333.750 335.000 330.000 330.000 331.667 333.333 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 340.000 340.833 341.667 342.500 343.333 344.167 345.000 346.000 347.000 348.000 349.000 350.000 350.000 351.000 352.000 353.000 354.000 355.000 355.833 356.667 357.500 358.333 359.167 360.000 360.833 361.667 362.500 363.333 364.167 365.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 371.667 373.333 375.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 380.000 382.500 385.000 386.667 388.333 390.000 390.000 390.000 390.000 390.000 392.500 395.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 425.000 430.000 430.000 430.000 430.000 430.000 435.000 435.000 440.000 440.000 440.000 445.000 445.000 445.000 446.659 448.490 450.521 452.789 455.335 458.216 461.500 465.281 469.679 474.859 481.050 488.581 497.937 509.875
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 0 0 0 0 0 0 66 66 0 0 0 0 63 0 0 0 54 72 72 0 0 66 66 0 69 75 78 69 66 0 0 69 0 0 75 0 0 0 0 0 0 0 0 57 57 0 57 0 0 57 0 60 0 0 0 54 0 0 0 0 0 51 0 0 0 63 54 0 57 0 60 0 0 54 0 60 51 54 57 0 63 63 54 60 0 0 51 54 0 63 60 51 57 57 0 0 57 57 60 60 57 60 63 63 66 63 66 66 57 60 63 66 66 66 66 57 60 63 51 57 60 63 63 60 63 51 57 60 54 57 57 54 57 54 57 51 54 54 0 54 45 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -2.734375 2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -1.953125 0.390625 0.390625 0.390625 0.390625 2.734375 0.390625 0.390625 0.390625 0.390625 -2.734375 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 0.390625 0.390625 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -1.953125 1.171875 0.390625 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 1.171875 1.171875 1.171875 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 -0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 2.734375 0.390625 -1.171875 1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="168">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.342 145.0 150.0 155.0 160.0 165.0 170.0 175.0 176.683 180.0 185.0 190.0 195.0 200.0 205.0 210.0 210.025 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 391.615 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.329 0.308 0.278 0.237 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.215 0.238 0.262 0.285 0.308 0.331 0.354 0.354 0.451 0.545 0.645 0.753 0.872 1.002 1.146 1.303 1.476 1.664 1.868 2.087 2.323 2.575 2.843 3.126 3.424 3.737 4.064 4.405 4.759 5.124 5.502 5.889 6.284 6.686 7.092 7.497 7.897 8.285 8.652 8.988 9.279 9.512 9.671 9.745 9.75 9.742 9.703 9.633 9.536 9.416 9.274 9.114 8.938 8.749 8.55 8.341 8.126 7.906 7.682 7.456 7.23 7.003 6.778 6.554 6.333 6.116 5.902 5.693 5.488 5.288 5.093 4.903 4.718 4.539 4.365 4.197 4.034 3.877 3.724 3.577 3.436 3.299 3.167 3.04 2.918 2.8 2.687 2.578 2.473 2.372 2.275 2.182 2.093 2.007 1.925 1.846 1.77 1.697 1.627 1.56 1.495 1.433 1.374 1.317 1.263 1.21 1.16 1.112 1.066 1.022 0.979 0.938 0.899 0.862 0.826 0.792 0.759 0.727 0.697 0.668 0.64 0.614 0.588 0.564 0.54 0.518 0.496 0.475 0.456 0.437 0.418 0.401 0.384 0.368 0.353 0.338 0.324 0.311 0.298 0.285 0.273 0.262 0.251 0.241 0.231 0.221 0.212 0.203

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="9.75" PeakHeight="391.615" Num="5" zHalfNm="342.568" Error="2.478">
-169.496 -21.666 11.099 -2.737 1.21
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="100.025" Depth="0.154"/>
<TopsideChapman PeakHeight="391.615" PeakDensity="1179435.5" PeakScaleHeight="36.696" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
